This an accurate dependable American made movement, I installed one of these movements in a clock of mine and 10 years later it is still going! Movement Specifications: Case size: 2-1/8"W x 2-1/8"H x 5/8"D. Shaft Diameter: 5/16" (8mm) Motor: Self-Start, 1 second step. Minute hand shaft is 11/16" overall and the threaded shaft is 7/16". Includes minute hand, hour hand, and second hand